Gael becht



O. REGI 'IT. SHEET METAL PIPE.

Patented Jan. 28, 1868.

WEE 2125565 ZZLVGHZOZ;

mites tetra strut titre.

CARL REGHT, or NEW YORK N. r.

Letters Patent No. 73,929, dated January 28, 18%.

IMPROVEMENT IN SHEET-METAL TEES.

tit: Srlptul: cam?! in in that damn: print art toting put of tip iitmit.

TU nub WHOM IT MAY CONCERN:

Be it knovm'tnat I, CARL REOHT, of the city, county, and State of New. York, have invented a certainnew and useful Improvement in Sheet-Metal Pipes and I do hereby declare the following to be a full, clear, and exact description thereof. reference being had to the accompanying drawings, making a part of this specification, inwhich Figure 1 is a view showing the manner in which I prefer to cut the sheemnemr plate, before proceeding to make a. pipe thereof.

Figure 2 is a side view, showing two ends of piping screwed together.

Figure 3 is a longitudinal section of the same.

Figure 4 is 'a transverse section on the line an m.

Figure 5 iss. side view ofia. detached length of pipe, in con unction with a gauge-plnte, shown in bluclines.

The object of my invention is to furnish a sheet-metal pipe that can be cheaply and quickly made, and that can be screwed together in consecutive portions, to any desired length.

My invention consists in taking a piece of sheet metal, and cutting it in the form of a rhomboid,.then to'rding or rolling it up into a cylinder or pipe, in such a manner as to leave an overlap on each end of said pipe, where the seam or rib comes, by means of which overlap I am enabled to turn a thread on the ends of said pipe, the said overlap ing the pi ch of the thread which is turned thereon.

in the (humans, A represents 9. length of pipe, one-end of which has a threpd made upon it, and theother end has not. I prefer to take a. piece of sheet metal, of rectangular form, asshonrn in fig. 1, and lay of! a distance, lm, on the line 0!. I1, equal to the desired pitch of the thread; lay oil the samedistance, Zm, on the line 0 d of the parallelogram a b c d, and draw the lines a m and (Z Z, and we have the figure or rhomboid a m d l,

which is cut out of the sheet a b c d. This rhomboidal sheet is now rolled up, and the end m d fastened to the and a Z, thus making a seam oi: rib common to all sheet-piping. It will be seen that during the folding of the sheet into a pipe, the points m and Z will remain in the same line or plane, perpendicular to the axis of revolution. Thus, when the'linc or endm d of thc'sheet is revolved to meet the line cf, (which We will call the line where the seamjon the pipe is formed,) and the line a Z- is revolved to meet the same line e f, we shall have formed a hollow sheet-metal pipe, between the ends m a and d l of which there .will be a distance, 2. This distunes 2; constitutes the pitch of the thread, which is afterwards turned on the ends of the pipe. After the sheet is made into a. pipe having the overlap 2, it is run between two rollers, made with ribs or corrugations, in a machine adapted to that purpose, and for which I have applied for Letters Patent of the United-States, This machine also is'provided with a plate, H, shown in blue, in connection with a. pipe, in the drawings, fig. 5, made with a surface corresponding to the end of. the pipe. The end of. the pipe being .kept up firmly against the said gauge-plate D, while the ribbed rollers in the machine are revolved, a. thread. is turned thereon, of the form exhibited in the drawings. The reason of this will become apparent; for when the ribbed rollers in the machine grasp the pipe, it (the pipe) is made to revolve in the direction of the red arrow, fig. 5, during which the part a of the pipe follows along the surface of the gauge-plate H, until it assumes the position p, when a complete revolution of the pipe will have occurred. It will be seen that the distance op is the pitch of the thread which is turned on the pipe. It will be obvious that instead of cutting the metal sheet in the rhomboidsl-form, and rollingit up so as to make the overlap z, the same end wodld be attained by cutting the end of the pipe as shown in fig. 5, after the pipe vras rolled into shape, but in practice, I find it better to out the metal sheets into the Il'loniboidal shapes first, thereby forming the pitch-of thepthreed on the ends of the pipe at once. It is also practicable to produce the overlap or pitch 2 on thc pipe, without cnttingit into rhoroboidal sheets first; time o, square or rectangular sheet of metal is rolled up into the form of a pipe, at the some time theendsa b and c d are pushed in opposite directions (as shown by the arrows, fig. 1,) until the desired overlep or pitch 2 is formed, then the seam or rib ismade, and the pipe putin theroochine, as before, andthe thread turned thereon.

I am aware that sheet-metal pipes have been made with threads on their ends, but such pipes have had the planes containing their ends perpendicular to the surface of the pipe,.the threads on'such pipe being terminated ,or intersected by these planes, as it were. The efi'ect of this construction has been to leave an awkward edge or linewhere two ends of pipe are joined together, which, in my invention, is avoided, b pipe of thesame configurntionwith the thread thereof; and in m y making the end of the made as herein described, for the purpose of turhi y invention I employ the ,ends'of the pipe, ng a. thread on the ends of said pipe.

C'laz'ms. Having thus fully described my said invention, what I claim, 1. Cutting sheetmetnl into rhomboid-s a Zd m, For the purpose of making nn overlap, '2, equal to the pitch of a thread, which, after rolling said rhomboida-l sheets into pipes, I turn on the ends of said pipes, sbibstantiaiiy as herein specified.

- 2. I claim making sheet-metal piping, the ends of which are parallel to the thread which is turned thereon substantially as herein specified.

and desire to secure by Letters Patent, is-

CARL REOHT. Witnesses:'

CHAS. MORRILL,

CHAS. E. Hone. 

